Fallback when Gnome-Keyring fails store in a file

Jira Issue: WP-795
Enabling PZP start in travis script

Jira Issue: WP-795
PZP callback handling modified

Jira Issue: WP-795
Jira Issue: WP-795
Gnome keyring alternative

Jira Issue: WP-795
Commented PZP test

Jira Issue: WP-795
Merge pull request #497 from habibvirji/WP-795-gnome-keyring-alternate

Fallback when Gnome-Keyring fails store in a file